Re: [PATCH v4 06/17] PCI: add SIOV and IMS capability detection

From: "Raj, Ashok" <ashok.raj@intel.com>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: Jason Gunthorpe <jgg@nvidia.com>,
	Dan Williams <dan.j.williams@intel.com>,
	"Tian, Kevin" <kevin.tian@intel.com>,
	"Jiang, Dave" <dave.jiang@intel.com>,
	Bjorn Helgaas <helgaas@kernel.org>,
	"vkoul@kernel.org" <vkoul@kernel.org>,
	"Dey, Megha" <megha.dey@intel.com>,
	"maz@kernel.org" <maz@kernel.org>,
	"bhelgaas@google.com" <bhelgaas@google.com>,
	"alex.williamson@redhat.com" <alex.williamson@redhat.com>,
	"Pan, Jacob jun" <jacob.jun.pan@intel.com>,
	"Liu, Yi L" <yi.l.liu@intel.com>,
	"Lu, Baolu" <baolu.lu@intel.com>,
	"Kumar, Sanjay K" <sanjay.k.kumar@intel.com>,
	"Luck, Tony" <tony.luck@intel.com>,
	"kwankhede@nvidia.com" <kwankhede@nvidia.com>,
	"eric.auger@redhat.com" <eric.auger@redhat.com>,
	"parav@mellanox.com" <parav@mellanox.com>,
	"rafael@kernel.org" <rafael@kernel.org>,
	"netanelg@mellanox.com" <netanelg@mellanox.com>,
	"shahafs@mellanox.com" <shahafs@mellanox.com>,
	"yan.y.zhao@linux.intel.com" <yan.y.zhao@linux.intel.com>,
	"pbonzini@redhat.com" <pbonzini@redhat.com>,
	"Ortiz, Samuel" <samuel.ortiz@intel.com>,
	"Hossain, Mona" <mona.hossain@intel.com>,
	"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	"kvm@vger.kernel.org" <kvm@vger.kernel.org>,
	Ashok Raj <ashok.raj@intel.com>
Subject: Re: [PATCH v4 06/17] PCI: add SIOV and IMS capability detection
Date: Mon, 9 Nov 2020 10:10:39 -0800	[thread overview]
Message-ID: <20201109181039.GA15472@otc-nc-03> (raw)
In-Reply-To: <87y2jaipwu.fsf@nanos.tec.linutronix.de>

On Mon, Nov 09, 2020 at 03:08:17PM +0100, Thomas Gleixner wrote:
> On Mon, Nov 09 2020 at 12:14, Thomas Gleixner wrote:
> > On Sun, Nov 08 2020 at 15:58, Ashok Raj wrote:
> >> On Sun, Nov 08, 2020 at 07:47:24PM +0100, Thomas Gleixner wrote:
> >> But for SIOV devices there is no PASID filtering at the remap level since
> >> interrupt messages don't carry PASID in the TLP.
> >
> > Why do we need PASID for VMM integrity?
> >
> > If the device sends a message then the remap unit will see the requester
> > ID of the device and if the message it sends is not 
> 
> That made me look at patch 4/17 which adds DEVMSI support to the
> remap code:
> 
> > +       case X86_IRQ_ALLOC_TYPE_DEV_MSI:
> > +              irte_prepare_msg(msg, index, sub_handle);
> >                break;
> 
> It does not setup any requester-id filter in IRTE. How is that supposed
> to be correct?
> 

Its missing a set_msi_sid() equivalent for the DEV_MSI type.